Aluminum 7178-T76; 7178-T7651
Subcategory: 7000 Series Aluminum Alloy; Aluminum Alloy; Metal; Nonferrous Metal
Close Analogs:
Composition Notes:
This designation is considered the sole original alloy for this alloy family.
Aluminum content reported is calculated as remainder.
Composition information provided by the Aluminum Association and is not for design.
Key Words: UNS A97178; Aluminium 7178-T76; Aluminium 7178-T7651; AA7178-T76; AA7178-T7651
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Material Notes:
Data points with the AA note have been provided by the Aluminum Association, Inc. and are NOT FOR DESIGN.
Physical Properties
| Physical Properties | Metric | English | Comments |
| Density | 2.83 g/cc | 0.102 lb/in³ | AA; Typical |
Mechanical Properties
| Hardness, Brinell | 152 | 152 | 500 kg load with 10 mm ball. Calculated value. |
| Hardness, Knoop | 193 | 193 | Converted from Brinell Hardness Value |
| Hardness, Rockwell A | 53.9 | 53.9 | Converted from Brinell Hardness Value |
| Hardness, Rockwell B | 88 | 88 | Converted from Brinell Hardness Value |
| Hardness, Vickers | 177 | 177 | Converted from Brinell Hardness Value |
| Ultimate Tensile Strength | 572 MPa | 83000 psi | AA; Typical |
| Tensile Yield Strength | 503 MPa | 73000 psi | AA; Typical |
| Elongation at Break | 11 % | 11 % | AA; Typical; 1/2 in. (12.7 mm) Diameter |
| Modulus of Elasticity | 73 GPa | 10600 ksi | |
| Modulus of Elasticity | 71 GPa | 10300 ksi | AA; Typical; Average of tension and compression. Compression modulus is about 2% greater than tensile modulus. |
| Compressive Yield Strength | 460 MPa | 66700 psi | 0.1% Permanent Set |
| Poisson’s Ratio | 0.33 | 0.33 | Estimated from trends in similar Al alloys. |
| Fatigue Strength | 160 MPa | 23200 psi | 500,000,000 Cycles |
| Shear Modulus | 27 GPa | 3920 ksi | Estimated from similar Al alloys. |
| Shear Strength | 340 MPa | 49300 psi | Calculated value. |
Electrical Properties
| Electrical Resistivity | 5e-006 ohm-cm | 5e-006 ohm-cm | Estimated from other heat treatments. |
Thermal Properties
| CTE, linear 68°F | 23.4 µm/m-°C | 13 µin/in-°F | AA; Typical; Average over 68-212°F range. |
| CTE, linear 250°C | 25.4 µm/m-°C | 14.1 µin/in-°F | Average over the range 20-300ºC |
| Specific Heat Capacity | 0.856 J/g-°C | 0.205 BTU/lb-°F | |
| Thermal Conductivity | 140 W/m-K | 972 BTU-in/hr-ft²-°F | Estimated from other heat treatments. |
| Melting Point | 477 – 629 °C | 890 – 1165 °F | AA; Typical range based on typical composition for wrought products 1/4 inch thickness or greater. Homogenization may raise eutectic melting temperature 20-40°F but usually does not eliminate eutectic melting. |
| Solidus | 477 °C | 890 °F | AA; Typical |
| Liquidus | 629 °C | 1165 °F | AA; Typical |
Processing Properties
| Annealing Temperature | 413 °C | 775 °F | |
| Solution Temperature | 468 °C | 875 °F | |
| Aging Temperature | 121 °C | 250 °F | for 24 hr |